- First conditioning/PBSCT: Patients receive high-dose thiotepa IV on days -7 to -5 and cyclophosphamide IV over 1 hour on days -5 to -2. CD34+ PBSC are reinfused on day 0. GM-CSF is administered SC beginning on day 5 and continuing until blood counts recover. If blood counts have not recovered by day 28, unselected PBSC are reinfused. In the absence of disease progression or unacceptable toxicity, patients proceed to the second conditioning/PBSCT.